The agreement between the contract: contract like one or more programs. The contract defines some conventions that must be followed when the applications to interact with other programs or Windows. Some settings of an application, we used to on the AppBar above, if it is not very common, such as the theme color of the application, you can put set contract, that is, by the super the menu tune out the settings panel. The following describes how we set the option to add the settings panel.

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